外源性NGF对坐骨神经损伤后脊髓前角细胞CNTF表达的影响

目的　探讨坐骨神经损伤后脊髓前角细胞睫状神经营养因子 (CNTF)表达变化及外源性神经生长因子(NGF)与CNTF表达的关系。方法　采用大鼠坐骨神经损伤动物模型 ,分为给药组和对照组 ,每只大鼠又分为损伤侧组 (L组 )和健侧组 (R组 )两个亚组。用原位杂交、免疫组化技术检测CNTF的表达水平 ,观察各组在 1d、7d、1 4d、2 1d及 2 8d时的变化。用计算机图像自动处理系统进行定量分析研究。结果　给药组损伤侧脊髓前角细胞中CNTF表达水平除 1d、7d组外其余均多于对照组 (P <0 .0 5 ) ;而两组健侧脊髓前角细胞中CNTF表达水平无统计学意义 (P >0 .0 5 )。结论　①外源性NGF能促进坐骨神经损伤后损伤侧脊髓前角细胞中CNTF表达水平的增加 ;而对健侧CNTF表达水平无明显作用。②坐骨神经损伤后损伤侧脊髓前角细胞中CNTF表达水平在最初的 3周内逐渐下降 ,然后开始恢复 ,但至第 4周尚未恢复到开始时的水平 ;而两组健侧CNTF表达水平则无明显差异 (P >0 .0 5 )。     

Treatment of fecal incontinence by temporary sacral nerve stimulation

Summary BACKGROUND: Sacral nerve stimulation (SNS) is an option for the treatment of fecal incontinence in patients with morphologically intact, but weak external anal sphincter. METHODS: In ten patients a percutaneous test-SNS was performed. Two patients suffered from fecal incontinence after surgery, one patient after incomplete leg palsy after traumatic spine injury and seven patients from idiopathic incontinence. Incontinence score, anorectal manometry and patient diary were performed before and after test-SNS. RESULTS: Intraoperative response (Bellows action) could be achieved in 90% of patients. Test-SNS was successful in 50% of patients. In these patients, resting pressure was increased by 100.1% and squeeze pressure by 84.5%. CONCLUSIONS: SNS is an effective therapy in a subset of patients with fecal incontinence. Fifty percent of patients tested are eligible for implantation of a permanent stimulation device.      

脑干、三叉神经及大脑动脉环的可视化研究

目的 建立人体脑干、三叉神经及大脑动脉环的可视化数字模型。方法 采用首例中国数字化可视人体数据集，在SGI工作站上对脑干及其周围毗邻结构进行计算机三维重建并立体显示。结果 获得人体脑干、三叉神经及大脑动脉环等器官组织的三维重建结构，可对其进行任意径线和角度的适时三维测量。结论 首例中国数字化可视人体数据集能够提供完整而精确的解剖断面数据，脑干及其毗邻的三叉神经、大脑动脉环的可视化模型准确反映出该区域复杂的解剖学结构特点及其相邻器官间的空间毗邻关系，可为该区域的疾病的影像诊断和外科治疗提供形态学依据。     

小脑延髓池的显微外科解剖研究

目的研究小脑延髓池的显微外科解剖特征,探讨其临床意义.方法选择经10%福尔马林固定成人头颈标本15例,显微镜下(5～25倍)模拟枕下极外侧入路、颈-乳突入路和耳前颞下窝入路的手术操作,分别自后、侧和前方显露小脑延髓池内结构,详细观测其神经血管结构的形态特征.结果小脑延髓池位于延髓外侧,上至桥延沟,下达枕骨大孔,侧方沿枕骨形成蛛网膜袖套进入颈静脉孔和舌下神经管.舌咽神经、迷走神经和副神经的根丝自上而下起自橄榄体背侧、延髓和脊髓的后外侧沟,根丝逐级汇合后分别进入舌咽神经道和迷走神经道.椎动脉于小脑延髓池的下端入颅后经该池行向前上内进入延髓前池.小脑下后动脉(PICA)可分为延髓前段、延髓侧段、扁桃体延髓段、脉络膜扁桃体段和皮质段.主要的静脉有小脑延髓裂内静脉、延髓静脉、小脑岩面下组静脉和岩下桥静脉.结论小脑绒球和Luschka孔脉络丛复合体及颈静脉孔硬膜返折可作为辨认舌咽神经脑池段的解剖标志,深刻认识小脑延髓池的蛛网膜界限对手术处理累及小脑延髓池的不同性质病变,保护重要神经功能意义重大.     

颈前部皮神经构筑研究

目的　为研究皮肤疾病和损伤提供皮神经构筑资料。方法　用S 10 0蛋白免疫组化染色法研究正常成人颈前部胸锁乳突肌前、后缘皮肤各层内皮神经的数量、分布及构筑特点。结果　 ( 1)皮肤乳头层内皮神经的小分支多分布在皮突下和乳头内血管丛附近。 ( 2 )真皮网状层内神经多位于小血管附近和汗腺、皮脂腺以及毛囊周围 ,神经分支呈串珠状或波纹形。 ( 3 )皮下组织内神经干和神经网同时存在。结论　皮肤内感觉神经树的分布及构筑特点与血管树相似。     

面神经颅外段血供的应用解剖学研究

目的探讨面神经颅外段的动脉来源及分布. 方法 15例新鲜尸体头颈部标本经双侧颈总动脉插管,加压注入红色乳胶或过氯乙烯填充剂,观察面神经颅外段的血供来源及分布. 结果面神经营养动脉来源于耳后动脉的茎乳动脉、颞浅动脉面神经支、面横动脉、颈外动脉上面神经支、颈外动脉下面神经支、面动脉后面神经支和面动脉前面神经支,其外径分别为(0.8±0.2) mm、(0.9±0.4) mm、(1.9±0.3) mm、(1.0±0.2) mm、(1.1±0.4) mm、(1.0±0.2) mm和(1.1±0.6) mm.各营养动脉除营养面神经外还发出分支相互吻合,构成了丰富的面神经血管网. 结论了解面神经颅外段动脉血供来源及分布,为避免腮腺咬肌区手术损伤面神经营养血管提供了解剖学基础.     

Transfer of 45Ca and 36Cl at the blood-nerve barrier of the sciatic nerve in rats fed low or high calcium diets

Unidirectional fluxes of 45Ca, 36Cl, and of [3H]mannitol from blood into the sciatic nerve and cerebral cortex were determined from 5- and 15-min uptakes of these tracers after an intravenous (i.v.) bolus injection in awake rats. Rats were fed diets for 8 wk, that had either a low (0.01% wt/wt), normal (0.67%), or high (3%) Ca content. Plasma [Ca] was 32% less and 11% more in rats fed low (LOCA) and high Ca diets (HICA), respectively, than in rats fed a normal Ca diet (CONT). The mean permeability-surface area product (PA) of 45Ca at the blood-nerve barrier was about eightfold higher than at the blood-brain barrier in the same animals and did not differ significantly between groups (greater than 0.05). Mean PA ratios of 45Ca/36Cl for the blood-nerve and blood-brain barriers in CONT rats, 0.52 +/- 0.04 and 0.40 +/- 0.02, respectively, were not significantly different from corresponding ratios in LOCA and HICA groups, and corresponded to the aqueous limiting diffusion ratio (0.45). Our results show no evidence for concentration-dependent transport of Ca over a plasma [Ca] range of 0.8-1.4 mmol/liter at the blood-nerve barrier of the rat peripheral nerve, and suggest that Ca and Cl exchange slowly between nerve and blood via paracellular pathways.     

Amphibian terminal nerve: distribution revealed by LHRH and AChE markers

Immunocytochemical and histochemical studies in the tiger salamander and bullfrog demonstrated the presence of luteinizing hormone-releasing hormone-like immunoreactive (LHRH-ir) material and acetylcholinesterase (AChE) in the terminal nerve (TN). Immunoreactive perikarya and processes were found within the olfactory, vomeronasal and trigeminal nerves and in the nasal epithelium. Central TN projections consisted of fibers terminating in the olfactory bulb and bundles that projected to another group of LHRH-ir perikarya in the preoptic region. Up to 4 weeks following hypophysectomy, the labeling intensity and number of TN-immunoreactive neurons were not altered. Acetylcholinesterase histochemistry in the salamander revealed two distinct groups of neurons associated with the TN: a lightly labeled group of fusiform perikarya was located in the olfactory nerve proper and a more heavily labeled group of larger oval perikarya was found within AChE-positive trigeminal fascicles in the ventral mucosa. This study has demonstrated that the amphibian TN follows olfactory, vomeronasal and trigeminal nerves to reach peripheral targets in the nasal mucosa. The projection of TN fibers to discrete olfactory bulb glomeruli, especially evident in the bullfrog, suggests that the TN functions in odor processing. The TN projection to the preoptic region in both of these amphibians implicates the TN in reproductive processes.     

体外培养诱导外周血淋巴细胞促进大鼠面神经再生的实验研究

目的:通过在神经缺损处局部回输体外分离培养纯化的淋巴细胞,了解此种方法促进面神经损伤修复的效果。方法:将20只Wistar大鼠的面神经颊支剪断并立即缝合(其余3支反折缝合)制成面神经损伤模型大鼠,将其分成淋巴细胞组和对照组,每组10只,每组再分成2周组和8周组。淋巴细胞组局部回输体外分离培养的外周血淋巴细胞,对照组作对照。于2周和8周测定面神经颊支-触须肌复合动作电位传导速度,辣根过氧化物酶(HRP)神经逆行示踪测定面神经核团的神经元阳性数目。结果:淋巴细胞组面神经颊支-触须肌复合动作电位传导速度8周时为0.64±0.07,与对照组(0.56±0.07)相比,差异有统计学意义(P<0.05)。HRP神经逆行示踪测定面神经核团神经元阳性数目,淋巴细胞组2周及8周与对照组同时间段相比差异均无统计学意义(均P>0.05)。结论:体外分离培养纯化的淋巴细胞在局部应用于神经损伤处对面神经再生修复可起一定的促进作用。